On 29 - 30 April 2019 Tongan delegation led by the His Royal Highness Prince Ata visited Huai Hong Krai Develoment Study Centre. Mr. Pawat Navamaratna, Deputy Secretary -General of the Royal Develooment Projects Board and Mr. Phirat Thupprasert, welcomed the delegation and gave the delegation the briefing on the center 's overview. The delegation experienced the activities being implemented in the Centre namely; development of water source, fish-bone system, check dam, integrated farming, livestock, fishery, food processing and promotion of development-oriented tourism.